I forgot to add the weight- the big ones are over 10 pounds at the moment. I'm also wondering if I should pick em once their skin is fully fingernail hard, or just let them sit till the vines die back? I have a load on the vines already, and more starting to grow and mature. I could only load one pic on the entry, here's a second one:

I want so say spaghetti squash but that is a bit big. Could be a cross pollinated spaghetti with a pumpkin. If there is no disease or insect threat I would leave them as long as you can!

I think it's one that's a full size spaghetti squash. Small Wonder is a hybrid maybe a mixed in seed or it didn't carry the desired trait of being a small fruited plant. I would let it mature more or just take one and cut it open to see if it has the fibrous flesh .

Thanks for the comments folks :) I was gone over the weekend and went to check them yesterday when I got home. The largest/oldest ones are now starting to go from creamy greenish to a pale butter yellow. Vines are looking healthy, so are the fruit.

Should I be putting anything under the fruits? They are just resting on the ground for the moment.

If its not overly wet I wouldn't worry about it I've never had any problems leaving them on the ground